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Date:	Thu, 30 Oct 2014 14:07:40 -0700
From:	Eric Dumazet <>
To:	Florian Westphal <>
Cc:	David Miller <>,
Subject: Re: [PATCH -next 0/2] net: allow setting ecn via routing table

On Thu, 2014-10-30 at 21:52 +0100, Florian Westphal wrote:

> So, what about changing the default to 1 in net-next?
> We could add automatic 'no-ecn' to retransmitted syns to avoid
> ecn blackholes (Daniel Borkmann has a patch for this), and, in case
> ecn=1 causes too much breakage we can always revert (and re-consider ecn
> per route settings as an intermediate step).
> What do you think?

I think this is way too dangerous.

I played a lot with ECN in the past (and fixed number of bugs in linux)
and discovered many times I had to disable it to be able to surf the

I am kind of an expert so always could figure out what was the problem,
but average user wont have the choice.

Reverting might take a long long time, it wont help people stuck behind
buggy equipment.

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